Irish lichens
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Order: Teloschistales Family: Teloschistaceae
Species: Caloplaca ulcerosa Photos: On deciduous tree trunk. Foynes, Co. Limerick, Ireland Identification needs confirming Thin grey-white thallus with pale yellowish-green soredia from blister-like craters. Soralia initially scattered but often become confluent. Scattered apothecia with orange discs, margins narrow. Spores 8-12 x 4-8 µm, septum 3-6 µm wide. Paraphyses with swollen tips. Apothecia and soredia K+ red Infrequent on nutrient-enriched mature trees in well-lit situations Similar: Caloplaca obscurella has brownish discs, thallus becomes bright green when wet, apothecia and thallus K- |
Caloplaca ulcerosa. September 2010